net/http: no error after reading from closed gzip HTTP/2 response body

[neild]

When reading a gzipped response body (via an *http2.gzipReader), closing the body doesn't necessarily cause subsequent reads to fail because gzipReader.Close only closes the underlying response body. Buffered data in the gzip.Reader can still be read.

This causes the existing test TestTransportGzip to fail when run in HTTP/2 mode.

[gopherbot]

Change https://go.dev/cl/440555 mentions this issue: x/net/http2: gzipReader will reset zr to nil after closing body